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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Di·a- Di- .  A prefix denoting through; also, between, apart, asunder, across. Before a vowel dia- becomes di-; as, diactinic; dielectric, etc.
 

From: WordNet (r) 2.0

 DIA
      n : an intelligence agency of the United States in the
          Department of Defense; is responsible for providing
          intelligence in support of military planning and
          operations and weappons acquisition [syn: Defense
          Intelligence Agency]